<template>
    <div>
           <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>



    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 头部警告区域 -->
         <el-alert show-icon title="注意： 只允许为第三级分类设置相关参数" type="warning" :closable="false">
  </el-alert>

  <!-- 选择商品分类区域 -->
    <el-row class="cat_opt">
        <el-col>
            <span>选择商品分类： </span>
            <!-- 选择商品分类的级联选择框  区域 -->
           <el-cascader
           expand-trigger="hover"
    v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
        </el-col>
    </el-row>


    <!-- tab 页签区域 -->
     <el-tabs v-model="activeName" @tab-click="handleTabClick">
         <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <!-- 作用域插槽 -->
                <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals " :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!-- 输入文本框 -->
                    <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- 添加的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
        <!-- 静态参数表格 -->
        <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <!-- 作用域插槽 -->
                <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals " :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!-- 输入文本框 -->
                    <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- 添加的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini"  @click="showEditDialog(scope.row.attr_id)" >编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
  </el-tabs>
    </el-card>


    <!-- 添加参数的对话框 -->
    <el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
  <!-- 添加参数的对话框 -->
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
  <!-- 添加参数的对话框 -->
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>


<script>
export default {
    data() {
        return {
            // 定义的是一个空数组 商品分类列表
            catelist:[],
            // 对象   级联选择框的配置对象
             cateProps:{
                 value:'cat_id',
                 label:'cat_name',
                 children:'children'
             },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态数据的参数
            manyTableData:[],
            // 静态数据的参数
            onlyTableData:[],
            // 控制对话框的显示和隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name: [
                    { required: true,message: '请输入参数名称',trigger: 'blur' }
                ]
            },
            // 控制修改对话框的显示喝隐藏
            editDialogVisible: false,
            // 修改的表单内数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name: [
                    { required: true,message: '请输入参数名称',trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList(){
            const { data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.console.error('获取商品分类失败')
            }

            this.catelist = res.data
            console.log(this.catelist)
        },
        // 级联选择框选中项变化，会触发这个函数
        handleChange(){
          this.getParamsData()
        },
        // tab 页签点击事件的处理事件
        handleTabClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        // 获取参数的列表的数据
        async getParamsData(){
             // console.log(this.selectedCateKeys)
           // 如果selectedCateKeys 数组的长度不是3， 证明选中的不是三级分类
           if(this.selectedCateKeys.length !== 3){
               this.selectedCateKeys = []
               this.manyTableData = []
               this.onlyTableData = []
               return
           }
           // 证明选中的是三级分类
           console.log(this.selectedCateKeys)
        //    根矩所选分类的Id，和当前所处的面板，获取当前的参数
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: { sel: this.activeName } 
        })
        if(res.meta.status !== 200){
            return this.$message.error('获取参数列表失败！')
        }

        // attr_vals 本来是个字符串，经过这个一个for循环就变成了一个数组
        res.data.forEach(item => {
            item.attr_vals = 
                    item.attr_vals.length === 0 ? []
                    : item.attr_vals.split(' ')
            // 控制输入框的显示和隐藏
            item.inputVisible = false
            // 文本框中输入的值
            item.inputValue = ''
        })

        console.log(res.data)
        if(this.activeName === 'many'){
            this.manyTableData = res.data
        }else{
            this.onlyTableData = res.data
        }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //  点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,
                {attr_name: this.addForm.attr_name, attr_sel: this.activeName
                })
                 if(res.meta.status !== 201){
                return this.$message.error('添加参数失败！')
            }
            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamsData()
            })
        },
        //点击按钮，展示修改的对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{ params:{attr_sel: this.activeName }
            })
            if(res.meta.status !== 200){
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible =true
        },
        // 重置修改的对话框
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                 const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name: this.editForm.attr_name, attr_sel:this.activeName })
                 if(res.meta.status !== 200){
                     return this.$message.error('修改参数失败！')
                 }
                 this.$message.success('修改参数成功！')
                 this.getParamsData()
                 this.editDialogVisible = false
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id){
            // 这里返回的是一个文本
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
        if(confirmResult !== 'confirm' ){
            return this.$message.info('已取消删除！')
        }
        // 删除的业务逻辑
        const { data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status !== 200){
            return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
        },
        // 文本框失去焦点，或摁下enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue= ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
           this.saveAttrVals(row)
        },
        // 将对 attr_vals 的操作，保存到数据库
        async saveAttrVals(row){
             // 需要发起请求，保存这次操作
             const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{ attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            // 服务器只接收字符串，需要把数组用join作拼接
            attr_vals:row.attr_vals.join(' ') })

            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功!')
        },
        // 点击按钮，展开文本输入框
        showInput(row){
            row.inputVisible = true 
            // 让文本框自动获取焦点
            // $nextTick：方法作用：就是当页面上元素被重新渲染的时候，才会指定回调函数中的代码
             this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        //  如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>


<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
</style>